Great site and very helpful info Alex!
I have to agree, though, that some items are ranked much lower than they deserve. Another clear example is the Darkmoon Card: Blue Dragon. It only requires level 60 to use (explaining the lower Blizz rank) but this one scales with level as it gives a percentage chance to allow full mana regen while casting:
Darkmoon Card: Blue Dragon
Binds when picked up
Requires Level 60
Equip: 2% chance on successful spellcast to allow 100% of your Mana regeneration to continue while casting for 15 sec. http://www.wowhead.com/?item=19288#comments
I know of a few healers that choose to equip this one instead of "endgame" epics for boss fights in BT and SSC. Wowhead and Thottbot posters rave about this trink on healers. I play both a resto druid and holy/disc priest. I use this card on both healing Kara and Z'A. On my druid with around 750 regen buffed, I have never run out of mana even while rolling lifeblooms as fast as I can cast them.
One of the best healing druid/priest trinks out there. I suspect it will be the same in WotLK too. It very clearly needs to be given a higher score.